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The problem you now have is that you used Calibre to convert an ePub that contains code for an embedded font. That is a big mistake as Calibre botches the code for embedded fonts in an ePub > ePub conversion. Now you have font code in every XML file when it belongs just once in the CSS. Once you have an ePub, don't use Calibre to convert it yet again to ePub. Calibre tends to do some things that are not good like moving embedded font code from the CSS to every XML file.
If I was going to edit my ePub, I'd use Notepad++ or you could use Sigil. But either way, don't convert ePub > ePub.
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